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Thread: brake fluid in clutch

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  1. #1
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    brake fluid in clutch

    I mistakenly flushed my clutch with brake fluid a few months ago. It felt different so I tryed to bleed it again when I let the resevoir run dry. It was then that I realized I should have been using mineral oil. I tried to flush it with mineral oil but can't seem to be able to get the clutch cylinder to pump. Have I ruined the handlebar and slave cylinders? Can either one be rebuilt or just replaced?

  2. #2
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    brake fluid will swell the rubber bits. Some times the rubber bits can be cleaned and will shrink as the brake fluid evaporates, with could take weeks or months. you probably need to replace all, including the lines.

    Rod

  3. #3
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    The system is filled from the fitting at the bottom near the slave. If you've had a system with wrong stuff in it for a long period there is a good chance you've damaged it but short of doing a flushing refill / test or a disassembly inspection there is no way to be certain. The cheap way out is to properly refill and hope for no leaks/ damge, A more cautious way is to hunt rebuild parts for the master and fit a new slave - this may be a dealer job for you..

  4. #4
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    If you have a stainless clutch line, its inerior liner is impervious to both clutch and brake fluid so should not need replacement BUT you do need to run enough fluid up the line to flush it. If the line is rubber, it will probably not be compatible with brake fluid and should be replaced.

  5. #5
    Nickname: Droid
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    That's right about the hose assembly, which I believe is a teflon lined S/S braided hose. The hose is not affected by the fluid. But the seals in the system "may" be affected. One way to find out is to research the part numbers for the seals, if those are available as individual part numbers.

    If the part numbers are the same for the seals in the clutch system as in the brake system, it would indicate the seals are not the issue. But if the part numbers are different, and the seal material is different, then very likely the seals have to be replaced if a thorough system flushing does not correct the issues.

    Not sure if flushing the system from the slave up to the master with Acetone or mineral spirits, or some other form of liquid solvent would clear the brake fluid from the system, and then flush again with vegetable oil. May be worth a try.

  6. #6
    Barback King rapiddog's Avatar
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    falsealarmism

    ...I doubt you have to worry about damage. Just get it flushed out with plenty of the correct fluid and you should be good to go.
    No point in replacing what's not broke.

    You've already paid enough by admitting what an idiot stunt you've done to all of use here...
    I'm just glad I read this post...I was about to do the same thing...
    "...the burble of my exhaust unwound like a long cord behind me. Soon my speed snapped it, and I heard only the cry of the wind...." Larry of Arubia

  7. #7
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    I hope I can save some of this system. I've checked the prices of clutch cylinder, hose slave cylinder and hose and it comes to almost $800. I'm going to try to flush and bleed system with correct fluid and go from there. The clutch cylinder is $370 and I know it could be rebuilt but I don't think anyone sells seals for it.

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